Most candidates promise to do something great, even historic, on their first day in office.

But this year's Republican presidential candidates are oddly and singularly focused: They'd all repeal Obamacare on Day One, and take our health care system right back to where it was.

These candidates apparently don't care who would lose services, pay more, or instantly find themselves uninsured, because they've all placed their bets on this promise getting them into the White House.